ByRobert Burns, Associated PressDecember 11, 2012

US Defense Secretary Leon Panetta (r.) talks to reporters while on board his plane headed to Kuwait on Monday. Mr. Panetta said that intelligence on Syria's alleged deployment of its chemical weapons has 'leveled off,' and may indicate that Syria has heeded Western warnings against their use.

Panetta was in Kuwait to visit U.S. troops at the start of a four-day trip. The US has about 13,500 troops in this country; they are a remnant of the 1991 Gulf War in which a US-led coalition force evicted Saddam Hussein's Iraqi army after it invaded Kuwait in August 1990.

Asked whether he believed Syrian President Bashar al-Assad was heeding Western warnings against using chemical weapons, Panetta said: "I like to believe he's got the message. We've made it pretty clear. Others have as well."

He noted that the Assad regime is coming under increasing pressure from rebel forces.

"Our concern is that if they feel like the regime is threatened with collapse, they might resort to these kinds of weapons," he said.

Syria is believed to have a formidable arsenal of chemical weapons, including sarin and mustard gas, although its exact dimensions are not known. Syria is not a signatory to the 1997 Convention on Chemical Weapons and thus is not obliged to permit international inspection.

In the interview with reporters on his flight from Washington, Panetta also said he expects Obama administration decisions in the next few weeks on what military missions and forces the US will seek to keep in Afghanistan after its combat mission ends Dec. 31, 2014.

The US now has about 66,000 troops in Afghanistan as part of an international coalition that has been fighting the Taliban for more than 11 years.

Panetta said he would consult further with Marine Gen. John Allen, the top coalition commander in Kabul, before making further recommendations to President Barack Obama on a post-2014 military presence.

Panetta also said he is encouraged by what he called a downward trend in the number of attacks on US and coalition forces by their Afghan partners. These so-called insider attacks accelerated for much of 2012, threatening to disrupt the US-Afghan military partnership.

Panetta said the number of such attacks fell from 12 in August to two in November.

"Steps that were put in place to try to deal with that threat I believe have been effective," he said. He did not mention specific steps, but they include more rigorous vetting of Afghan army and police recruits and a requirement that US troops carry loaded weapons at all times, even when on coalition or Afghan bases.